Evaporative crystallization device for waste heat of high-salinity wastewater

Abstract

The utility model belongs to the technical field of wastewater treatment of smelting equipment, and particularly relates to a high-salinity wastewater waste heat evaporative crystallization device. The device comprises a smelting furnace, a smelting waste heat boiler, a smelting electric dust remover, an arsenic collecting device, a smelting high-temperature fan, a converting furnace, a converting waste heat boiler, a converting electric dust remover, an adiabatic evaporation tower, an atomizing spray gun, a cyclone dust remover and a converting high-temperature fan. Wherein the output end of the smelting furnace is communicated with the input end of the smelting waste heat boiler through a pipeline, and the output end of the smelting waste heat boiler is communicated with the input end of the smelting electric dust remover through a pipeline. According to the utility model, the adiabatic evaporation tower and the cyclone dust collector are additionally arranged behind the blowing electric dust collector, and the high-salinity wastewater access pipe and the atomizing spray gun are arranged on the adiabatic evaporation tower, so that the evaporation degree of the high-salinity wastewater is improved by controlling the atomizing spray quantity, and the high-salinity wastewater is completely evaporated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to smelting equipment wastewater treatment technical field, concretely relates to a kind of high-salinity wastewater residual heat evaporation crystallization device. BACKGROUND

[0002] The current smelting industry's tail gas desulfurization and denitration system is heavy, and alkali spraying is often used to control the emission of tail gas. Specifically, when the flue gas containing acidic substances (usually sulfur dioxide or high-valence nitrogen oxides after ozone reaction) passes through the alkali spraying tower, the alkaline substances in the alkali solution will react with the acidic substances in the flue gas to generate salt and water, thereby purifying the tail gas.

[0003] During the process of discharging the salt-containing waste liquid from the tail gas desulfurization and denitration system, when the salt content of the spraying solution accumulates too much or is not discharged in time, problems such as absorption saturation and equipment blockage are likely to occur, so a large amount of salt-containing wastewater needs to be discharged to maintain the absorption efficiency. However, this large amount of salt-containing wastewater discharge increases the pressure on wastewater treatment and increases the treatment cost.

[0004] Therefore, the utility model designs a high-salinity wastewater residual heat evaporation crystallization device. By adding an adiabatic evaporation tower and a cyclone dust collector after the blowing electric dust collector, and installing a high-salinity wastewater inlet pipe and an atomizing spray gun on the adiabatic evaporation tower, the evaporation degree of high-salinity wastewater is improved by controlling the atomizing spray amount, so that the high-salinity wastewater is completely evaporated. SUMMARY

[0005] Based on the technical problems existing in the prior art, the utility model provides a high-salinity wastewater residual heat evaporation crystallization device. By adding an adiabatic evaporation tower and a cyclone dust collector after the blowing electric dust collector, and installing a high-salinity wastewater inlet pipe and an atomizing spray gun on the adiabatic evaporation tower, the evaporation degree of high-salinity wastewater is improved by controlling the atomizing spray amount, so that the high-salinity wastewater is completely evaporated.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A high-salinity wastewater residual heat evaporation crystallization device, comprising a smelting furnace, a smelting residual heat boiler, a smelting electric dust collector, an arsenic collection device, a smelting high-temperature fan, a blowing furnace, a blowing residual heat boiler, a blowing electric dust collector, an adiabatic evaporation tower, an atomizing spray gun, a cyclone dust collector, and a blowing high-temperature fan.

[0008] The output end of the smelting furnace is connected to the input end of the smelting residual heat boiler through a pipeline, and the output end of the smelting residual heat boiler is connected to the input end of the smelting electric dust collector through a pipeline.

[0009] The output end of the smelting electric dust collector is provided with two branches, which are a first branch and a second branch respectively, and the smelting electric dust collector can be connected with the external flue gas acid-making system through the first branch and the second branch.

[0010] The output end of the blowing furnace is connected with the input end of the blowing waste heat boiler through a pipeline, the output end of the blowing waste heat boiler is connected with the input end of the blowing electric dust collector through a pipeline, and the output end of the blowing electric dust collector is connected with the input end of the adiabatic evaporation tower through a pipeline.

[0011] The adiabatic evaporation tower is provided with two output ends, which are a first output end and a second output end respectively, and the first output end is connected with the input end of the cyclone dust collector through a pipeline.

[0012] The second output end is connected with a first discharge pipe, and the material in the adiabatic evaporation tower is discharged from the bottom through the first discharge pipe.

[0013] The cyclone dust collector is provided with two output ends, which are a third output end at the top and a fourth output end at the bottom respectively, and the third output end at the top of the cyclone dust collector is connected with the input end of the blowing high-temperature fan through a pipeline, and the blowing high-temperature fan can be connected with the external flue gas acid-making system.

[0014] The fourth output end at the bottom of the cyclone dust collector is connected with a second discharge pipe, and the material in the cyclone dust collector is discharged from the bottom through the second discharge pipe.

[0015] Further, the first branch is connected with the input end of the arsenic collecting device, the output end of the arsenic collecting device is connected with the input end of the smelting high-temperature fan through a pipeline, and the output end of the smelting high-temperature fan is connected with the external flue gas acid-making system through a first acid-making discharge pipe.

[0016] Further, the second branch is connected with the side wall of the first acid-making discharge pipe.

[0017] Further, a first valve is arranged on the first branch.

[0018] Further, a second valve is arranged on the second branch.

[0019] Further, a third valve is arranged on the first discharge pipe.

[0020] Further, the upper part of the adiabatic evaporation tower is provided with a lance insertion port, the output end of the atomizing lance is inserted into the lance insertion port at the upper part of the adiabatic evaporation tower, and the input end of the atomizing lance is connected with the external high-salinity wastewater through a high-salinity wastewater connection pipe; the main components of the high-salinity wastewater are sodium sulfate 5-30 g / L and sodium chloride 1-10 g / L, and the temperature is 10-30℃ at normal temperature when connected.

[0021] Further, a fourth valve is arranged on the high-salinity wastewater connection pipe. Further, a fourth valve is arranged on the high-salinity wastewater connection pipe.

[0022] Further, the cyclone dust collector comprises a dust collector body and a dust hopper communicated with the bottom end of the dust collector body.

[0023] Further, the second discharging pipe is provided with a fifth valve.

[0024] Further, the output end of the blowing high-temperature fan is communicated with an external flue gas acid-making system through the second acid-making discharging pipe.

[0025] Further, the discharging end of the first acid-making discharging pipe and the discharging end of the second acid-making discharging pipe are both communicated with the external flue gas acid-making system through a connecting acid-making discharging main pipe.

[0026] Compared with the prior art, the utility model has the advantages of:

[0027] 1. The utility model discloses an improvement on the blowing and refining dust collection system of the prior art, and an adiabatic evaporation tower and a cyclone dust collector are added behind the blowing electric dust collector, a high-salinity wastewater inlet pipe and an atomizing lance are installed on the adiabatic evaporation tower, the evaporation degree of the high-salinity wastewater is improved by controlling the atomizing spraying amount, and the high-salinity wastewater is completely evaporated.

[0028] 2. The utility model can treat the high-salinity alkaline solution discharged by the desulfurization and denitrification spray tower, and can also treat the high-salinity concentrated water in the sewage workshop, thereby reducing the discharge amount of the high-salinity wastewater, reducing the pressure on the sewage workshop for treating wastewater and reducing the cost of the environmental protection system. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the high-salinity wastewater waste heat evaporation crystallization device described in embodiment 1.

[0030] 1-1, smelting furnace, 1-2, smelting waste heat boiler, 2-1, smelting electric dust collector, 2-2, arsenic collection device, 2-3, smelting high-temperature fan, 2-4, first branch, 2-5, second branch, 2-6, first acid-making discharging pipe, 3-1, blowing furnace, 3-2, blowing waste heat boiler, 4-1, blowing electric dust collector, 4-2, adiabatic evaporation tower, 4-3, atomizing lance, 4-4, cyclone dust collector, 4-5, blowing high-temperature fan, 4-6, first discharging pipe, 4-7, second discharging pipe, 4-8, high-salinity wastewater inlet pipe, 4-9, second acid-making discharging pipe. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the utility model, the following will combine the drawings of the specification and the preferred embodiments to make a more comprehensive and detailed description of the utility model, but the protection scope of the utility model is not limited to the following specific embodiments.

[0032] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0033] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0034] Example 1

[0035] like Figure 1 As shown, a high-salt wastewater waste heat evaporation and crystallization device includes a smelting furnace 1-1, a smelting waste heat boiler 1-2, a smelting electrostatic precipitator 2-1, and an arsenic collection device 2-2 (the arsenic collection device 2-2 is a 7000㎡ high-efficiency arsenic collector; for details, please refer to patent documents CN202222115638.2 A bag filter with selective blowing function, and CN202210000862.9 A device for rapid extraction of high-purity arsenic trioxide in non-ferrous smelting). The system includes a high-temperature smelting blower 2-3, a smelting furnace 3-1, a smelting waste heat boiler 3-2, a smelting electrostatic precipitator 4-1, an adiabatic evaporation tower 4-2, an atomizing spray gun 4-3, a cyclone dust collector 4-4, and a high-temperature smelting blower 4-5. The principle of the arsenic collection device 2-2 is to rapidly cool the arsenic-containing flue gas at 300℃ to 150℃ by spraying water, causing arsenic trioxide to change from a gaseous state to a solid state. The arsenic trioxide is then collected by mechanical filtration, and the clean flue gas enters the high-temperature smelting blower 2-3.

[0036] The output end of the smelting furnace 1-1 is connected to the input end of the smelting waste heat boiler 1-2 through a pipeline, and the output end of the smelting waste heat boiler 1-2 is connected to the input end of the smelting electrostatic precipitator 2-1 through a pipeline.

[0037] The output end of the electrostatic precipitator 2-1 for smelting is provided with two branches, namely the first branch 2-4 and the second branch 2-5. The first branch 2-4 is connected to the input end of the arsenic collection device 2-2. The output end of the arsenic collection device 2-2 is connected to the input end of the high-temperature blower 2-3 for smelting through a pipeline. The output end of the high-temperature blower 2-3 for smelting is connected to the external flue gas acid production system through the first acid production discharge pipe 2-6.

[0038] The first valve is located on the first branch 2-4 (not shown in the figure);

[0039] The second branch 2-5 is connected to the side wall of the first acid discharge pipe 2-6; a second valve (not shown in the figure) is provided on the second branch 2-5.

[0040] The output end of the blowing furnace 3-1 is connected to the input end of the blowing waste heat boiler 3-2 through a pipeline, the output end of the blowing waste heat boiler 3-2 is connected to the input end of the blowing electric dust collector 4-1 through a pipeline, and the output end of the blowing electric dust collector 4-1 is connected to the input end of the adiabatic evaporation tower 4-2 through a pipeline;

[0041] The bottom of the adiabatic evaporation tower 4-2 is provided with two output ends, namely a first output end and a second output end, and the first output end is connected to the input end of the cyclone dust collector 4-4 through a pipeline;

[0042] The second output end is connected with a first discharge pipe 4-6, and the solid material in the adiabatic evaporation tower 4-2 is discharged from the bottom through the first discharge pipe 4-6; and a third valve (not shown in the figure) is arranged on the first discharge pipe 4-6.

[0043] The upper part of the adiabatic evaporation tower 4-2 is provided with a lance insertion port, the output end of the atomizing lance 4-3 is inserted into the lance insertion port at the upper part of the adiabatic evaporation tower 4-2, and the input end of the atomizing lance 4-3 is connected to the external high-salinity wastewater through a high-salinity wastewater connecting pipe 4-8; the main components of the high-salinity wastewater are sodium sulfate 5-30 g / L and sodium chloride 1-10 g / L, and the temperature is 10-30 DEG C at normal temperature when the high-salinity wastewater is connected.

[0044] A fourth valve (not shown in the figure) is arranged on the high-salinity wastewater connecting pipe 4-8.

[0045] The cyclone dust collector 4-4 comprises a dust collector body and a hopper connected to the bottom end of the dust collector body.

[0046] The cyclone dust collector 4-4 is provided with two output ends, namely a third output end at the top (arranged at the upper part of the dust collector body) and a fourth output end at the bottom end (arranged at the bottom end of the hopper), the third output end at the top of the cyclone dust collector 4-4 is connected to the input end of the blowing high-temperature fan 4-5 through a pipeline, and the output end of the blowing high-temperature fan 4-5 is connected to the external flue gas acid-making system through a second acid-making discharge pipe 4-9; the third output end is a waste gas discharge end, and can discharge the centrifuged waste gas in the cyclone dust collector 4-4.

[0047] The fourth output end at the bottom end of the cyclone dust collector 4-4 is connected with a second discharge pipe 4-7, and the solid material in the cyclone dust collector 4-4 is discharged from the bottom through the second discharge pipe 4-7; and a fifth valve (not shown in the figure) is arranged on the second discharge pipe 4-7.

[0048] Further, the discharge end of the first acid-making discharge pipe 2-6 and the discharge end of the second acid-making discharge pipe 4-9 are both connected to an acid-making external discharge main pipe, so as to be connected to the external flue gas acid-making system.

[0049] The operation mode of the utility model is as follows:

[0050] This invention involves atomizing high-salt wastewater through an atomizing spray gun 4-3, changing the water from a liquid to a gaseous state. This gas then comes into direct contact with the 300°C high-temperature flue gas entering the adiabatic evaporation tower 4-2, absorbing heat from the flue gas and reducing its temperature to 200°C. This utilizes the principle of adiabatic evaporation to recover and utilize waste heat. After the water in the high-salt wastewater evaporates into a gaseous state, the salt crystallizes and precipitates out, and is discharged through the first discharge pipe 4-6. Specifically:

[0051] 1. Gold and copper concentrate reacts with oxygen in smelting furnace 1-1 at 1200℃. The resulting high-temperature flue gas at 1100℃ is cooled to 350℃ by smelting waste heat boiler 1-2. The white smoke dust is then collected by smelting electrostatic precipitator 2-1, and arsenic trioxide is collected by arsenic collection device 2-2. The remaining sulfur dioxide flue gas is sent to the acid production system by smelting high-temperature fan 2-3.

[0052] 2. The matte produced by the smelting furnace 1-1 enters the blowing furnace 3-1, where it undergoes a blowing reaction with compressed air. The blowing flue gas discharged from the blowing furnace 3-1 is cooled to 350°C by the blowing waste heat boiler 3-2 and collected by the blowing electrostatic precipitator 4-1 before entering the adiabatic evaporation tower 4-2. The sulfur dioxide flue gas is sent to the acid production system by the blowing high temperature fan 4-5.

[0053] The flue gas discharged from smelting furnace 1-1 and blowing furnace 3-1 both contain sulfur dioxide, so they are sent to the same acid production system for acid production.

[0054] By controlling the amount of high-salt wastewater entering the adiabatic evaporator 4-2, the outlet flue gas temperature of evaporator 4-2 is controlled at 200℃, and the flue gas flow rate is adjusted according to the needs of the high-temperature blower 4-5, thereby achieving the evaporation of high-salt wastewater from the desulfurization, denitrification, or wastewater treatment workshops. Specifically, the inlet temperature of the adiabatic evaporator 4-2 is controlled at 350℃, the outlet temperature at 200℃, and the air flow rate of the adiabatic evaporator 4-2 is 40,000 m³ / h. 3 / h, can evaporate 3t / h of high-salt wastewater, achieving zero steam consumption in the evaporation process.

[0055] 3. The input end of the atomizing spray gun 4-3 is connected to an external high-salt wastewater via a high-salt wastewater inlet pipe 4-8. The external high-salt wastewater comes from the desulfurization and denitrification or sewage treatment workshop. The high-salt wastewater transported from the desulfurization and denitrification or sewage treatment workshop enters the atomizing spray gun 4-3 on the adiabatic evaporation tower 4-2 and comes into contact with the blowing flue gas to evaporate. By controlling the atomization spray volume, the high-salt wastewater is completely evaporated.

[0056] 4. During normal use, the pH value of the high-salt wastewater must be greater than 7, and the wastewater must not contain F. - Cl - Plasma; if using F- Cl - For the high-salt wastewater of the plasma, the adiabatic evaporation tower 4-2 and the cyclone dust collector 4-4 need to be made of 2507 stainless steel or SMO254 special stainless steel.

[0057] 5, the salt-containing flue gas evaporated by the adiabatic evaporation tower 4-2 enters the cyclone dust collector 4-4, and the flue gas flow entering the cyclone dust collector 4-4 moves along the cylindrical wall in a circular manner, under the action of centrifugal force, salt particles and the like are thrown to the wall, and under the action of gravity, they fall along the wall into the hopper, and are discharged from the second discharge pipe 4-7 connected to the bottom end of the dust collector 4-4, thereby achieving the effect of desalination.

[0058] 6, the flue gas after desalination by the cyclone dust collector 4-4 is sent to the acid making section by the blowing high-temperature fan 4-5.

[0059] 7, the cyclone dust collector 4-4 can handle a larger flow of gas, but the separation efficiency is affected by the flue gas flow, temperature, inlet concentration and the like, and various factors need to be considered comprehensively during use.

[0060] The beneficial effects of the utility model are as follows:

[0061] The utility model improves the blowing and dust collecting system of the existing blowing furnace, adds the adiabatic evaporation tower 4-2 and the cyclone dust collector 4-4 after the blowing electric dust collector 4-1, installs the high-salt wastewater access pipe 4-8 and the atomizing spray gun 4-3 on the adiabatic evaporation tower 4-2, controls the atomizing spray amount, improves the evaporation degree of the high-salt wastewater, and makes the high-salt wastewater evaporate completely.

[0062] The utility model can handle the high-salt alkaline solution discharged by the desulfurization and denitrification spray tower, and can also handle the high-salt concentrated water of the sewage workshop, reduces the discharge amount of the high-salt wastewater, reduces the pressure of the sewage workshop for treating wastewater, and reduces the cost of the environmental protection system.

[0063] The system structure is simple, convenient to operate, and can be applied to the treatment of high-salt alkaline solution or high-salt wastewater.

[0064] In the description of the utility model, it should be pointed out that for the orientation words, such as the terms "center", "transverse", "vertical", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a specific orientation, structure and operation, and cannot be understood as limiting the specific protection scope of the utility model.

[0065] It should be noted that the terms "first", "second", and the like in the description and in the claims of this application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of such terms is arbitrary and made solely for the sake of non-ambiguity in some instances, and that the scope of the application is not limited to a given embodiment. In addition, the terms "comprising", "having", "including", and "containing" are to be construed as open-ended terms (i.e., meaning "including, but not limited to,") unless otherwise noted. Further, it is intended that the embodiments of the application described herein can be used in any combination so long as the expression is not expressly recited in the claims.

[0066] Finally, it should be noted that the above-mentioned merely preferred embodiments and technical principles of the present application are used to explain the present application. It should be understood by those skilled in the art that the present application is not limited to the specific embodiments described herein. Various obvious changes, modifications and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the specific embodiments described herein. More other effective embodiments can be included without departing from the concept of the present application, and the scope of the present application is determined by the appended claims.

Claims

1. A high-salinity wastewater residual heat evaporation crystallization device, characterized in that, The smelting furnace, the smelting waste heat boiler, the smelting electric dust collector, the arsenic collecting device, the smelting high-temperature fan, the converting furnace, the converting waste heat boiler, the converting electric dust collector, the adiabatic evaporation tower, the atomizing spray gun, the cyclone dust collector and the converting high-temperature fan; The output end of the smelting furnace is connected with the input end of the smelting waste heat boiler through a pipeline, and the output end of the smelting waste heat boiler is connected with the input end of the smelting electric dust collector through a pipeline. The output end of the smelting electric dust collector is provided with two branches, i.e., a first branch and a second branch, and the smelting electric dust collector can be connected with the external flue gas acid-making system through the first branch and the second branch. The output end of the converting furnace is connected with the input end of the converting waste heat boiler through a pipeline, the output end of the converting waste heat boiler is connected with the input end of the converting electric dust collector through a pipeline, and the output end of the converting electric dust collector is connected with the input end of the adiabatic evaporation tower through a pipeline. The adiabatic evaporation tower is provided with two output ends, i.e., a first output end and a second output end, and the first output end is connected with the input end of the cyclone dust collector through a pipeline. The cyclone dust collector is provided with two output ends, i.e., a third output end at the top and a fourth output end at the bottom, and the third output end at the top of the cyclone dust collector is connected with the input end of the converting high-temperature fan through a pipeline, and the converting high-temperature fan can be connected with the external flue gas acid-making system.

2. The high-salinity wastewater thermovapor-compression crystallization device of claim 1, wherein, The first branch is connected with the input end of the arsenic collecting device, the output end of the arsenic collecting device is connected with the input end of the smelting high-temperature fan through a pipeline, and the output end of the smelting high-temperature fan is connected with the external flue gas acid-making system through a first acid-making discharge pipe.

3. The high-salinity wastewater thermovapor-compression crystallization device of claim 2, wherein, The second branch is connected with the side wall of the first acid-making discharge pipe.

4. The high-salinity wastewater thermovapor-compression crystallization device of claim 1, wherein, A first valve is arranged on the first branch.

5. The high-salinity wastewater thermovapor-compression crystallization device of claim 1, wherein, A second valve is arranged on the second branch.

6. The high salinity wastewater thermolytic evaporative crystallization device of claim 1, wherein, The second output end is connected with a first discharge pipe, and a third valve is arranged on the first discharge pipe.

7. The high-salinity wastewater thermovapor-compression crystallization device of claim 1, wherein, The upper part of the adiabatic evaporation tower is provided with a spray gun insertion port, the output end of the atomizing spray gun is inserted into the spray gun insertion port of the upper part of the adiabatic evaporation tower, and the input end of the atomizing spray gun is connected with the external high-salinity wastewater through a high-salinity wastewater connection pipe.

8. The high-salinity wastewater thermovapor-compression crystallization device of claim 7, wherein, A fourth valve is arranged on the high-salinity wastewater connection pipe.

9. The high salinity wastewater thermolytic evaporative crystallization device of claim 1, wherein, The fourth output end at the bottom of the cyclone dust collector is connected with a second discharge pipe, and a fifth valve is arranged on the second discharge pipe.

10. The high salinity wastewater thermolytic evaporative crystallization device of claim 1, wherein, The output end of the converting high-temperature fan is connected with the external flue gas acid-making system through a second acid-making discharge pipe.

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